/*
 * Autocomplete - jQuery plugin 1.0.2
 *
 * Copyright (c) 2007 Dylan Verheul, Dan G. Switzer, Anjesh Tuladhar, Jörn Zaefferer
 *
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 *
 * Revision: $Id: jquery.autocomplete.js 5747 2008-06-25 18:30:55Z joern.zaefferer $
 *
 */

;(function($) {

$.fn.extend({
   autocomplete: function(urlOrData, options) {
      var isUrl = typeof urlOrData == "string";
      options = $.extend({}, $.Autocompleter.defaults, {
         url: isUrl ? urlOrData : null,
         data: isUrl ? null : urlOrData,
         delay: isUrl ? $.Autocompleter.defaults.delay : 10,
         max: options && !options.scroll ? 10 : 150
      }, options);

      // if highlight is set to false, replace it with a do-nothing function
      options.highlight = options.highlight || function(value) { return value; };

      // if the formatMatch option is not specified, then use formatItem for backwards compatibility
      options.formatMatch = options.formatMatch || options.formatItem;

      return this.each(function() {
         new $.Autocompleter(this, options);
      });
   },
   result: function(handler) {
      return this.bind("result", handler);
   },
   search: function(handler) {
      return this.trigger("search", [handler]);
   },
   flushCache: function() {
      return this.trigger("flushCache");
   },
   setOptions: function(options){
      return this.trigger("setOptions", [options]);
   },
   unautocomplete: function() {
      return this.trigger("unautocomplete");
   }
});

$.Autocompleter = function(input, options) {

   var KEY = {
      UP: 38,
      DOWN: 40,
      DEL: 46,
      TAB: 9,
      RETURN: 13,
      ESC: 27,
      COMMA: 188,
      PAGEUP: 33,
      PAGEDOWN: 34,
      BACKSPACE: 8
   };

   // Create $ object for input element
   var $input = $(input).attr("autocomplete", "off").addClass(options.inputClass);

   var timeout;
   var previousValue = "";
   var cache = $.Autocompleter.Cache(options);
   var hasFocus = 0;
   var lastKeyPressCode;
   var config = {
      mouseDownOnSelect: false
   };
   var select = $.Autocompleter.Select(options, input, selectCurrent, config);

   var blockSubmit;

   // prevent form submit in opera when selecting with return key
   window.opera && $(input.form).bind("submit.autocomplete", function() {
      if (blockSubmit) {
         blockSubmit = false;
         return false;
      }
   });

   // only opera doesn't trigger keydown multiple times while pressed, others don't work with keypress at all
   $input.bind((window.opera ? "keypress" : "keydown") + ".autocomplete", function(event) {
      // track last key pressed
      lastKeyPressCode = event.keyCode;
      switch(event.keyCode) {

         case KEY.UP:
            event.preventDefault();
            if ( select.visible() ) {
               select.prev();
            } else {
               onChange(0, true);
            }
            break;

         case KEY.DOWN:
            event.preventDefault();
            if ( select.visible() ) {
               select.next();
            } else {
               onChange(0, true);
            }
            break;

         case KEY.PAGEUP:
            event.preventDefault();
            if ( select.visible() ) {
               select.pageUp();
            } else {
               onChange(0, true);
            }
            break;

         case KEY.PAGEDOWN:
            event.preventDefault();
            if ( select.visible() ) {
               select.pageDown();
            } else {
               onChange(0, true);
            }
            break;

         // matches also semicolon
         case options.multiple && $.trim(options.multipleSeparator) == "," && KEY.COMMA:
         case KEY.TAB:
         case KEY.RETURN:
            if( selectCurrent() ) {
               // stop default to prevent a form submit, Opera needs special handling
               event.preventDefault();
               blockSubmit = true;
               return false;
            }
            break;

         case KEY.ESC:
            select.hide();
            break;

         default:
            clearTimeout(timeout);
            timeout = setTimeout(onChange, options.delay);
            break;
      }
   }).focus(function(){
      // track whether the field has focus, we shouldn't process any
      // results if the field no longer has focus
      hasFocus++;
   }).blur(function() {
      hasFocus = 0;
      if (!config.mouseDownOnSelect) {
         hideResults();
      }
   }).click(function() {
      // show select when clicking in a focused field
      if ( hasFocus++ > 1 && !select.visible() ) {
         onChange(0, true);
      }
   }).bind("search", function() {
      // TODO why not just specifying both arguments?
      var fn = (arguments.length > 1) ? arguments[1] : null;
      function findValueCallback(q, data) {
         var result;
         if( data && data.length ) {
            for (var i=0; i < data.length; i++) {
               if( data[i].result.toLowerCase() == q.toLowerCase() ) {
                  result = data[i];
                  break;
               }
            }
         }
         if( typeof fn == "function" ) fn(result);
         else $input.trigger("result", result && [result.data, result.value]);
      }
      $.each(trimWords($input.val()), function(i, value) {
         request(value, findValueCallback, findValueCallback);
      });
   }).bind("flushCache", function() {
      cache.flush();
   }).bind("setOptions", function() {
      $.extend(options, arguments[1]);
      // if we've updated the data, repopulate
      if ( "data" in arguments[1] )
         cache.populate();
   }).bind("unautocomplete", function() {
      select.unbind();
      $input.unbind();
      $(input.form).unbind(".autocomplete");
   });


   function selectCurrent() {
      var selected = select.selected();
      if( !selected )
         return false;

      var v = selected.result;
      previousValue = v;

      if ( options.multiple ) {
         var words = trimWords($input.val());
         if ( words.length > 1 ) {
            v = words.slice(0, words.length - 1).join( options.multipleSeparator ) + options.multipleSeparator + v;
         }
         v += options.multipleSeparator;
      }

      $input.val(v);
      hideResultsNow();
      $input.trigger("result", [selected.data, selected.value]);
      return true;
   }

   function onChange(crap, skipPrevCheck) {
      if( lastKeyPressCode == KEY.DEL ) {
         select.hide();
         return;
      }

      var currentValue = $input.val();

      if ( !skipPrevCheck && currentValue == previousValue )
         return;

      previousValue = currentValue;

      currentValue = lastWord(currentValue);
      if ( currentValue.length >= options.minChars) {
         $input.addClass(options.loadingClass);
         if (!options.matchCase)
            currentValue = currentValue.toLowerCase();
         request(currentValue, receiveData, hideResultsNow);
      } else {
         stopLoading();
         select.hide();
      }
   };

   function trimWords(value) {
      if ( !value ) {
         return [""];
      }
      var words = value.split( options.multipleSeparator );
      var result = [];
      $.each(words, function(i, value) {
         if ( $.trim(value) )
            result[i] = $.trim(value);
      });
      return result;
   }

   function lastWord(value) {
      if ( !options.multiple )
         return value;
      var words = trimWords(value);
      return words[words.length - 1];
   }

   // fills in the input box w/the first match (assumed to be the best match)
   // q: the term entered
   // sValue: the first matching result
   function autoFill(q, sValue){
      // autofill in the complete box w/the first match as long as the user hasn't entered in more data
      // if the last user key pressed was backspace, don't autofill
      if( options.autoFill && (lastWord($input.val()).toLowerCase() == q.toLowerCase()) && lastKeyPressCode != KEY.BACKSPACE ) {
         // fill in the value (keep the case the user has typed)
         $input.val($input.val() + sValue.substring(lastWord(previousValue).length));
         // select the portion of the value not typed by the user (so the next character will erase)
         $.Autocompleter.Selection(input, previousValue.length, previousValue.length + sValue.length);
      }
   };

   function hideResults() {
      clearTimeout(timeout);
      timeout = setTimeout(hideResultsNow, 200);
   };

   function hideResultsNow() {
      var wasVisible = select.visible();
      select.hide();
      clearTimeout(timeout);
      stopLoading();
      if (options.mustMatch) {
         // call search and run callback
         $input.search(
            function (result){
               // if no value found, clear the input box
               if( !result ) {
                  if (options.multiple) {
                     var words = trimWords($input.val()).slice(0, -1);
                     $input.val( words.join(options.multipleSeparator) + (words.length ? options.multipleSeparator : "") );
                  }
                  else
                     $input.val( "" );
               }
            }
         );
      }
      if (wasVisible)
         // position cursor at end of input field
         $.Autocompleter.Selection(input, input.value.length, input.value.length);
   };

   function receiveData(q, data) {
      if ( data && data.length && hasFocus ) {
         stopLoading();
         select.display(data, q);
         autoFill(q, data[0].value);
         select.show();
      } else {
         hideResultsNow();
      }
   };

   function request(term, success, failure) {
      if (!options.matchCase)
         term = term.toLowerCase();
      var data = cache.load(term);
      // recieve the cached data
      if (data && data.length) {
         success(term, data);
      // if an AJAX url has been supplied, try loading the data now
      } else if( (typeof options.url == "string") && (options.url.length > 0) ){

         var extraParams = {
            timestamp: +new Date()
         };
         $.each(options.extraParams, function(key, param) {
            extraParams[key] = typeof param == "function" ? param() : param;
         });

         $.ajax({
            // try to leverage ajaxQueue plugin to abort previous requests
            mode: "abort",
            // limit abortion to this input
            port: "autocomplete" + input.name,
            dataType: options.dataType,
            url: options.url,
            data: $.extend({
               q: lastWord(term),
               limit: options.max
            }, extraParams),
            success: function(data) {
               var parsed = options.parse && options.parse(data) || parse(data);
               cache.add(term, parsed);
               success(term, parsed);
            }
         });
      } else {
         // if we have a failure, we need to empty the list -- this prevents the the [TAB] key from selecting the last successful match
         select.emptyList();
         failure(term);
      }
   };

   function parse(data) {
      var parsed = [];
      var rows = data.split("\n");
      for (var i=0; i < rows.length; i++) {
         var row = $.trim(rows[i]);
         if (row) {
            row = row.split("|");
            parsed[parsed.length] = {
               data: row,
               value: row[0],
               result: options.formatResult && options.formatResult(row, row[0]) || row[0]
            };
         }
      }
      return parsed;
   };

   function stopLoading() {
      $input.removeClass(options.loadingClass);
   };

};

$.Autocompleter.defaults = {
   inputClass: "ac_input",
   resultsClass: "ac_results",
   loadingClass: "ac_loading",
   minChars: 1,
   delay: 400,
   matchCase: false,
   matchSubset: true,
   matchContains: false,
   cacheLength: 10,
   max: 100,
   mustMatch: false,
   extraParams: {},
   selectFirst: true,
   formatItem: function(row) { return row[0]; },
   formatMatch: null,
   autoFill: false,
   width: 0,
   multiple: false,
   multipleSeparator: ", ",
   highlight: function(value, term) {
      return value.replace(new RegExp("(?![^&;]+;)(?!<[^<>]*)(" + term.replace(/([\^\$\(\)\[\]\{\}\*\.\+\?\|\\])/gi, "\\$1") + ")(?![^<>]*>)(?![^&;]+;)", "gi"), "<strong>$1</strong>");
   },
    scroll: true,
    scrollHeight: 180
};

$.Autocompleter.Cache = function(options) {

   var data = {};
   var length = 0;

   function matchSubset(s, sub) {
      if (!options.matchCase)
         s = s.toLowerCase();
      var i = s.indexOf(sub);
      if (i == -1) return false;
      return i == 0 || options.matchContains;
   };

   function add(q, value) {
      if (length > options.cacheLength){
         flush();
      }
      if (!data[q]){
         length++;
      }
      data[q] = value;
   }

   function populate(){
      if( !options.data ) return false;
      // track the matches
      var stMatchSets = {},
         nullData = 0;

      // no url was specified, we need to adjust the cache length to make sure it fits the local data store
      if( !options.url ) options.cacheLength = 1;

      // track all options for minChars = 0
      stMatchSets[""] = [];

      // loop through the array and create a lookup structure
      for ( var i = 0, ol = options.data.length; i < ol; i++ ) {
         var rawValue = options.data[i];
         // if rawValue is a string, make an array otherwise just reference the array
         rawValue = (typeof rawValue == "string") ? [rawValue] : rawValue;

         var value = options.formatMatch(rawValue, i+1, options.data.length);
         if ( value === false )
            continue;

         var firstChar = value.charAt(0).toLowerCase();
         // if no lookup array for this character exists, look it up now
         if( !stMatchSets[firstChar] )
            stMatchSets[firstChar] = [];

         // if the match is a string
         var row = {
            value: value,
            data: rawValue,
            result: options.formatResult && options.formatResult(rawValue) || value
         };

         // push the current match into the set list
         stMatchSets[firstChar].push(row);

         // keep track of minChars zero items
         if ( nullData++ < options.max ) {
            stMatchSets[""].push(row);
         }
      };

      // add the data items to the cache
      $.each(stMatchSets, function(i, value) {
         // increase the cache size
         options.cacheLength++;
         // add to the cache
         add(i, value);
      });
   }

   // populate any existing data
   setTimeout(populate, 25);

   function flush(){
      data = {};
      length = 0;
   }

   return {
      flush: flush,
      add: add,
      populate: populate,
      load: function(q) {
         if (!options.cacheLength || !length)
            return null;
         /*
          * if dealing w/local data and matchContains than we must make sure
          * to loop through all the data collections looking for matches
          */
         if( !options.url && options.matchContains ){
            // track all matches
            var csub = [];
            // loop through all the data grids for matches
            for( var k in data ){
               // don't search through the stMatchSets[""] (minChars: 0) cache
               // this prevents duplicates
               if( k.length > 0 ){
                  var c = data[k];
                  $.each(c, function(i, x) {
                     // if we've got a match, add it to the array
                     if (matchSubset(x.value, q)) {
                        csub.push(x);
                     }
                  });
               }
            }
            return csub;
         } else
         // if the exact item exists, use it
         if (data[q]){
            return data[q];
         } else
         if (options.matchSubset) {
            for (var i = q.length - 1; i >= options.minChars; i--) {
               var c = data[q.substr(0, i)];
               if (c) {
                  var csub = [];
                  $.each(c, function(i, x) {
                     if (matchSubset(x.value, q)) {
                        csub[csub.length] = x;
                     }
                  });
                  return csub;
               }
            }
         }
         return null;
      }
   };
};

$.Autocompleter.Select = function (options, input, select, config) {
   var CLASSES = {
      ACTIVE: "ac_over"
   };

   var listItems,
      active = -1,
      data,
      term = "",
      needsInit = true,
      element,
      list;

   // Create results
   function init() {
      if (!needsInit)
         return;
      element = $("<div/>")
      .hide()
      .addClass(options.resultsClass)
      .css("position", "absolute")
      .appendTo(document.body);

      list = $("<ul/>").appendTo(element).mouseover( function(event) {
         if(target(event).nodeName && target(event).nodeName.toUpperCase() == 'LI') {
               active = $("li", list).removeClass(CLASSES.ACTIVE).index(target(event));
             $(target(event)).addClass(CLASSES.ACTIVE);
           }
      }).click(function(event) {
         $(target(event)).addClass(CLASSES.ACTIVE);
         select();
         // TODO provide option to avoid setting focus again after selection? useful for cleanup-on-focus
         input.focus();
         return false;
      }).mousedown(function() {
         config.mouseDownOnSelect = true;
      }).mouseup(function() {
         config.mouseDownOnSelect = false;
      });

      if( options.width > 0 )
         element.css("width", options.width);

      needsInit = false;
   }

   function target(event) {
      var element = event.target;
      while(element && element.tagName != "LI")
         element = element.parentNode;
      // more fun with IE, sometimes event.target is empty, just ignore it then
      if(!element)
         return [];
      return element;
   }

   function moveSelect(step) {
      listItems.slice(active, active + 1).removeClass(CLASSES.ACTIVE);
      movePosition(step);
        var activeItem = listItems.slice(active, active + 1).addClass(CLASSES.ACTIVE);
        if(options.scroll) {
            var offset = 0;
            listItems.slice(0, active).each(function() {
            offset += this.offsetHeight;
         });
            if((offset + activeItem[0].offsetHeight - list.scrollTop()) > list[0].clientHeight) {
                list.scrollTop(offset + activeItem[0].offsetHeight - list.innerHeight());
            } else if(offset < list.scrollTop()) {
                list.scrollTop(offset);
            }
        }
   };

   function movePosition(step) {
      active += step;
      if (active < 0) {
         active = listItems.size() - 1;
      } else if (active >= listItems.size()) {
         active = 0;
      }
   }

   function limitNumberOfItems(available) {
      return options.max && options.max < available
         ? options.max
         : available;
   }

   function fillList() {
      list.empty();
      var max = limitNumberOfItems(data.length);
      for (var i=0; i < max; i++) {
         if (!data[i])
            continue;
         var formatted = options.formatItem(data[i].data, i+1, max, data[i].value, term);
         if ( formatted === false )
            continue;
         var li = $("<li/>").html( options.highlight(formatted, term) ).addClass(i%2 == 0 ? "ac_even" : "ac_odd").appendTo(list)[0];
         // Make sure the last item gets a css class
         if (i+1 == max)
            $(li).addClass('ac_lastitem');

         $.data(li, "ac_data", data[i]);
      }
      listItems = list.find("li");
      if ( options.selectFirst ) {
         listItems.slice(0, 1).addClass(CLASSES.ACTIVE);
         active = 0;
      }

      // apply bgiframe if available
      if ( $.fn.bgiframe )
         list.bgiframe();
   }

   return {
      display: function(d, q) {
         init();
         data = d;
         term = q;
         fillList();
      },
      next: function() {
         moveSelect(1);
      },
      prev: function() {
         moveSelect(-1);
      },
      pageUp: function() {
         if (active != 0 && active - 8 < 0) {
            moveSelect( -active );
         } else {
            moveSelect(-8);
         }
      },
      pageDown: function() {
         if (active != listItems.size() - 1 && active + 8 > listItems.size()) {
            moveSelect( listItems.size() - 1 - active );
         } else {
            moveSelect(8);
         }
      },
      hide: function() {
         element && element.hide();
         listItems && listItems.removeClass(CLASSES.ACTIVE);
         active = -1;
      },
      visible : function() {
         return element && element.is(":visible");
      },
      current: function() {
         return this.visible() && (listItems.filter("." + CLASSES.ACTIVE)[0] || options.selectFirst && listItems[0]);
      },
      show: function() {
         var offset = $(input).offset();
         element.css({
            width: typeof options.width == "string" || options.width > 0 ? options.width : $(input).width(),
            top: offset.top + input.offsetHeight,
            left: offset.left
         }).show();
            if(options.scroll) {
                list.scrollTop(0);
                list.css({
               maxHeight: options.scrollHeight,
               overflow: 'auto'
            });

                if(/msie/.test(navigator.userAgent.toLowerCase()) && typeof document.body.style.maxHeight === "undefined") {
               var listHeight = 0;
               listItems.each(function() {
                  listHeight += this.offsetHeight;
               });
               var scrollbarsVisible = listHeight > options.scrollHeight;
                    list.css('height', scrollbarsVisible ? options.scrollHeight : listHeight );
               if (!scrollbarsVisible) {
                  // IE doesn't recalculate width when scrollbar disappears
                  listItems.width( list.width() - parseInt(listItems.css("padding-left")) - parseInt(listItems.css("padding-right")) );
               }
                }

            }
      },
      selected: function() {
         var selected = listItems && listItems.filter("." + CLASSES.ACTIVE).removeClass(CLASSES.ACTIVE);
         return selected && selected.length && $.data(selected[0], "ac_data");
      },
      emptyList: function (){
         list && list.empty();
      },
      unbind: function() {
         element && element.remove();
      }
   };
};

$.Autocompleter.Selection = function(field, start, end) {
   if( field.createTextRange ){
      var selRange = field.createTextRange();
      selRange.collapse(true);
      selRange.moveStart("character", start);
      selRange.moveEnd("character", end);
      selRange.select();
   } else if( field.setSelectionRange ){
      field.setSelectionRange(start, end);
   } else {
      if( field.selectionStart ){
         field.selectionStart = start;
         field.selectionEnd = end;
      }
   }
   field.focus();
};

})(jQuery);